Warp stop-motion for looms.



No. 769,174. PATENTED SEPT. 6, 1904. V. A. .LEDOUX. WARP STOP MOTION FOR LOOMS.

APPLICATION FILED JUNE 2| 1904.

N0 MODEL.

j? uw y g l L .5 5-

UNITED STATES i Igatented September 6, 1904. Y

PATENT OEEICE.

DRAPER COMPANY, OF HOPEDALE, MASSACHUSETTS, A CORPORA- TION OF MAINE.

WARP STOP-MOTION FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 769,174, dated September 6, 1904.

i g Application filed June 2, 1904. Serial No. 210,814. (No model.) I l T0 all whom it puny-concern:

Be it known that I, VALMOR A. LEDoUX, a citizen of the United States, and a resident of Worcester,county of Worcester, State of Massachusetts, have invented an Improvement in Warp Stop-Motions for Looms, of which the following description, in connection with the accompanying drawings, is a specicatiom like characters on the drawing` representing like parts.

This invention relates to warp stop-motions for looms wherein automatic stoppage of the loom is effected by or through the abnormal positioning of a' controlling-detector which is underproper working conditions maintained 4in normal or inoperative position by a warpvthread coperating therewith.

In weaving with very light warp the constantly-recurring weight of the detectors upon the threads is not only detrimental to the appearance of the cloth, but not infrequently dinterferes very greatly with the proper operation of the loom, as the warp-threads are undesirably depressed and stretched, and they are scraped by the detectors, causing warp breakage.

My present invention has for its object the production of means to support the detectors for a number of picks in such manner that they will exert no pressure on the warpthreads, the support being then moved to permit the detectorsto cooperate with the warpthreads for several picks-as,for instance, two

picks-so that detection of a broken warpthread may be effected and the loom stopped. When such cooperation of the detectors with thewarp-threads takes place at quite widely separated intervals of short duration, the objections hereinbefore noted are obviated and very light or soft warp-threads can be used in connection with the stop-motion mechanism. The novel features of my invention will be fully described in the subjoined specification and particularly pointed out in the following claims. 4 The drawing represents in transverse section a suflicient portion of a loom tobe under-L `whip roll or bar -W may be and are all of wellknown or usual construction.

A series of warp-stop-motion controlli-ngdetectors d, which may be made as thin, flat,

and elongated metallic strips, are arranged to .effect the automatic stoppage of the looml upon detection of warp failure, each detector in the present embodiment of my invention having an elongated warp-receiving opening d and a second elongated opening Z2 at its upper end. The series of detectors are s hown as located between the harnesses and the leaserods, and each detector coperates with two warp-threads zo w' in the two planes of the shed, as herein shown, though it will be manifest that each de tector could cooperate with a single warp-thread, if desired, the threads passing through the openings d.

At each side of the loom a bracket 1 is mounted, (for convenience on the arch A2,) having bearings 2 2, one above the other, to slidablyl detectors, which latter have a collective movement up and down with said support, and they also have at times an individual movement relative thereto permitted by the length of the slot d2.' The lower ends of the detectors are movable between a back-stop 6 and a guide-bar 7, extended transversely from one to the other side of the loom. Below the back-stop a transverse rock-shaft 8 is mounted in suitable bearings and has an attached feeler 9, which normally vibrates below the lower ends of the detectors, as is common in warp stop-motions of lthis type. When the support 5 is moved down' ward from the position shown toward the warps and far enough to permit the detectors to be supported by the warp-threads in the upper plane of the shed. the detectors can then feel the threads, each detector feeling first one of its two warp-threads and then the other on succeeding picks. If either thread fails, then on the corresponding feeling-pick the detector will be unsupported and will descend into position to engage and arrest the feeler 9, and through any well-known intermediate mechanism (not herein shown) the shipper S is released and the loom is stopped. Then the support 5 is raised into the position shown, however, it engages the upper ends of the slots (Z2 and lifts all of the detectors out of feeling position, as herein shown, so that at such time the weight of the detectors is supported wholly independently of the warpthreads.

I have devised simple and effective means to raise the detector-support and maintain the detectors in non-feeling position for a predetermined number of picks, so that the warpthreads are relieved of the weight of the detectors, and then to lower the support for a less number of picks, so that while the support is lowered the detectors can feel the warp-threads and detect warp failure to effect stoppage of the loom. On one of the loom sides a horizontal stud 10 is fiXedly mounted, and a cam C, having a short low portion, as c, and a long high portion, as c, is rotatably mounted on the stud, a ratchet 11 being secured to and to rotate with the cam. The ratchet is herein shown as provided with ten teeth for purposes of illustration, the lower part c of the cam corresponding to two teeth.

A pawl-carrier 12, mounted to rock on the stud, has a pawl 13, adapted to cooperate with the ratchet, the lower end of the pawl-earrier being extended at 14C and pivotally connected with a link 15, having an elongated slot 16 in its front end to loosely receive a pin 17 on the lay-sword AX. At each beat of the lay the pawl-carrier will be rocked, and the pawl will advance the ratchet one tooth, the cam being turned a corresponding angular distance.

Any other convenient mode of actuating the pawl-carrier from a moving part of the loom may be used instead of the particular device shown.

An arm 18, fulerumed at 19 on the loomframe, is slotted at its front end at Q0 to loosely receive a lateral pin 21 on the lower end of the slide-bar 3, and a roll 22 on the arm 18 travels on the edge of the cam'C. rlhe roll is on the high part of the cam, as shown, and the detectors are held off from the warps by the support 5; but on the next stroke of the pawl the roll will drop onto the lower part c of the cam, and the support 5 will descend, permittingthe detectors to coperate with and feel the warp-threads. rIhis will continue for two picks, as herein arranged, and then the high part of the cam will act upon the roll l2 and lift the detector-support and the detectors to the position illustrated, which position will be maintained for eight picks.

By varying the shape of the cam and the number of teeth in the ratchet the relative length of the feeling and nonfeeling periods of the detectors can be changed, as may be desired, so that the warp-threads are relieved of the pressure of the detectors for the greater part of the time, such pressure or weight having to be sustained by the threads at separated intervals only long enough to enable the detection of warp failure to be effected.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a warp stop-motion for looms, a series of stop-motion controlling-detecters capable of collective movement to engage and feel the warp-threads and also having an imlividual movement upon detection of the failure of a warp-thread, a support for said detectors, and means to move the same to maintain the den tectors collectively stationary and out of warpfeeling position for a number of successive picks and thereafter to move the support into and maintain it stationary in another position during a less number of picks to permit individual movement of a detector upon failure of its warpthread- 2. In a warp stop-motion for looms, a series of stop-motion controlliiig-detectors, a movable support for and to hold the detectors stationary and out of warp-feeling position during a predetermined number of picks, and means to move the support to permit said detectors to feel the warp-threads during a less number of picks.

3. In a warp stop-motion for looms, a series of stop-motion controlling-detectors, a vcrticallyanovable support for said detectors and relatively to which they at times have an individual longitudinal movement, and means to move the support in one direction and maintain it at rest to lift said detectors from pressing upon the warp-threads during a predetermined number of picks, and thereafter to move said support in the opposite direction to permit the warp-threauls to sustain the detectors during a less number of picks.

y 4. In a warp stop-motion for looms, a series of stop motion controlling -detectors each adapted to intermittingly cope ate with two warp-threads to detect the condition thereof, a movable support for said detectors, and means to move said support to sustain the weight of the detectors and maintain them stationary during a relatively long interval and to thereafter permit the detectors to coperatc with the warp-threads for a relatively short interval corresponding to at least two successive picks.

5. ,In a warp stop-motion for looms, a series IOO lIO

of stop motion controlling detectors each adapted tolintermittingly coperate with two Warp-threads to detect the condition thereof, means to permit said detectorsto remain in position to feel for and detect Warp failure during tWo successive picks and thereafter to and to govern the position of said detectors collectively With relation to the Warp-threads,

means, including a rotatable cam, to control .by or through a moving part of the vibrations of said support and through the latter maintain the'detectors out of Warpfeeling position for a predetermined numberl of picks and thereafter return them to feeling position for a less number of picks, and mechanism including a paWlY and ratchet operated rotate the cam step by step.

' In testimony WhereofI have signed my name to this specification in the presence of two subscribing Witnesses.

VALMOR A. LEDOUX.

Witnesses:

WALTER W. CLARK, Louis O. ST. MARTIN.

the loom to 

